Permanent patellar dislocation after a nonoperative treatment of recurrent dislocation of the patella because of trochlear dysplasia: a case report and review of the literature.

[trochlear dysplasia]

Patellar instability is a common knee injury in children and adolescents . After first -time dislocation , a nonoperative course is widespread . In cases of recurrent patellar dislocation , operative therapy is widely recommended . This case report shows the complicating history after a period of numerous patellar dislocations with primarily spontaneous reduction and a nonreducible dislocation at the follow-up 2 years after a nonoperative treatment .